Click Here to visit our Sponsor
The History of Computing The Magazine Have Fun there ! Buy goodies to support us
  Mistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine
Browse computer museumBrowse pong museum


ZX Spectrum T-shirts!

see details
Ready prompt T-shirts!

see details
ZX81 T-shirts!

see details
Atari joystick T-shirts!

see details
Arcade cherry T-shirts!

see details
Spiral program T-shirts!

see details
Battle Zone T-shirts!

see details
Vectrex ship T-shirts!

see details
Elite spaceship t-shirt T-shirts!

see details
Atari ST bombs T-shirts!

see details
Moon Lander T-shirts!

see details
C64 maze generator T-shirts!

see details
Competition Pro Joystick T-shirts!

see details
Pak Pak Monster T-shirts!

see details
BASIC code T-shirts!

see details
Breakout T-shirts!

see details
Pixel adventure T-shirts!

see details
Vector ship T-shirts!

see details

T > TOSHIBA  > HX-20 / HX-21 (Pasopia IQ)   

HX-20 / HX-21 (Pasopia IQ)

This is a classic MSX 1 computer, quite similar to the HX-10, except that the shape is different and there are two cartridge slots.

Its special feature seems to be a primitive word processor software built-in ROM. You need a separate Kanji ROM cartridge for it to work.

Does someone know the other differences?

In its native country (Japan), the HX-20 was also named Pasopia IQ to fit in the Pasopia family developped by Toshiba. Pasopia IQ was used for their MSX computers serie.

There was also a HX-21 computer. It had some minor design changes: like red line - instead of green - below brand and model names. But the main difference seems to be a RGB video output for the HX-21.

We need more info about this console ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


This was the first computer we owned, I was 13 and the whole family had some great times on it. I loved the ROM cartridges which would play as soon as you plugged them in so no waiting for the game to load! A great computer with a great, sturdy keyboard.

Tuesday 24th February 2015
Francis Groves (UK)

je suis en possession d''un appareil Toshiba HX21 et je désire en connaitre la valeur pour le vendre ou le donner

Monday 30th July 2012
brocheton (FRANCE)


NAME  HX-20 / HX-21 (Pasopia IQ)
YEAR  1984
BUILT IN SOFTWARE / GAMES  Microsoft Extended Basic (MSX Basic V1.0)
CONTROLLERS  QWERTY mechanical keyboard with 4 function keys, and arrow keys.
SPEED  3,6 Mhz
CO-PROCESSOR  Video Display Processor TMS 9929A
RAM  64 kb
VRAM  16 kb
ROM  32 kb
TEXT MODES  Mode 0 : 40 x 24
Mode 1 : 32 x 24
GRAPHIC MODES  Mode 2 : 256 x 192 with 16 colors (Hires mode)
Mode 3 : 64 x 48 with 16 colors (Multi colour mode)
32 sprites
SOUND  General Instruments AY-3-8910 Programmable Sound Generator
3 channels, 8 octaves
SIZE / WEIGHT  370 x 245 x 60 mm / 2,8 kg
I/O PORTS  2 joystick sockets, 2 cardridge slots, Tape-recorder connector (1200/2400 bauds), Composite video output, Centronics interface, RF video output, Expansion bus, Stereo audio output
HX-21 : RGB analog video output
POWER SUPPLY  Power supply built-in
PRICE  Unknown

Please buy a t-shirt to support us !
Ready prompt
ZX Spectrum
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
Vector ship

Related Ebay auctions in real time - click to buy yours

see more Toshiba  HX-20 / HX-21 (Pasopia IQ) Ebay auctions !

Click here to go to the top of the page   
Contact us | members | about | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -